It doesn't exactly help with your goal, but tangentially, I use a browser addon called DeArrow, from the creator of SponsorBlock, which replaces thumbnails and

It doesn't exactly help with your goal, but tangentially, I use a browser addon called DeArrow, from the creator of SponsorBlock, which replaces thumbnails and clickbait titles with a video still / user-submitted ones. I often forget it's installed until I use another browser, but it's a really nice experience! https://dearrow.ajay.app/ https://dearrow.ajay.app/